﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage.Streams;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Wrox.Metro.Common;
using Wrox.Metro.DataModel;
using Wrox.Metro.Notification;
using Wrox.Metro.Storage;

// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=234227

namespace Wrox.Metro
{
  /// <summary>
  /// Provides application-specific behavior to supplement the default Application class.
  /// </summary>
  sealed partial class App : Application
  {
    /// <summary>
    /// Initializes the singleton application object.  This is the first line of authored code
    /// executed, and as such is the logical equivalent of main() or WinMain().
    /// </summary>
    public App()
    {
      this.InitializeComponent();
      this.Suspending += OnSuspending;
    }

    /// <summary>
    /// Invoked when the application is launched normally by the end user.  Other entry points
    /// will be used when the application is launched to open a specific file, to display
    /// search results, and so forth.
    /// </summary>
    /// <param name="args">Details about the launch request and process.</param>
    protected override async void OnLaunched(LaunchActivatedEventArgs args)
    {
      // Do not repeat app initialization when already running, just ensure that
      // the window is active
      if (args.PreviousExecutionState == ApplicationExecutionState.Running)
      {
        Window.Current.Activate();
        return;
      }

      if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
      {
        //TODO: Load state from previously suspended application
      }

      await InitSampleDataAsync();

      TileManager.UpdateTile();


      // Create a Frame to act navigation context and navigate to the first page
      var rootFrame = new Frame();
      if (!rootFrame.Navigate(typeof(MainPage)))
      {
        throw new Exception("Failed to create initial page");
      }

      // Place the frame in the current Window and ensure that it is active
      Window.Current.Content = rootFrame;
      Window.Current.Activate();
    }

    private static async Task InitSampleDataAsync()
    {
      var storage = new MenuCardStorage();
      var imageStorage = new MenuCardImageStorage();
      if (await storage.IsRoamingFolderEmpty())
      {
        List<MenuCard> menuCards = MenuCardFactory.GetSampleMenuCards().ToList();

        foreach (var card in menuCards)
        {
          RandomAccessStreamReference streamRef = RandomAccessStreamReference.CreateFromUri(new Uri(card.ImagePath));
          using (IRandomAccessStreamWithContentType stream = await streamRef.OpenReadAsync())
          {
            card.ImagePath = string.Format("{0}.png", Guid.NewGuid());
            await imageStorage.WriteImageAsync(stream, card.ImagePath);
          }
        }

        await storage.WriteMenuCardsAsync(menuCards);
      }
    }

    /// <summary>
    /// Invoked when application execution is being suspended.  Application state is saved
    /// without knowing whether the application will be terminated or resumed with the contents
    /// of memory still intact.
    /// </summary>
    /// <param name="sender">The source of the suspend request.</param>
    /// <param name="e">Details about the suspend request.</param>
    private async void OnSuspending(object sender, SuspendingEventArgs e)
    {
      var deferral = e.SuspendingOperation.GetDeferral();
      //TODO: Save application state and stop any background activity
      await SuspensionManager.SaveAsync();
      deferral.Complete();
    }

    /// <summary>
    /// Invoked when the application is activated as the target of a sharing operation.
    /// </summary>
    /// <param name="args">Details about the activation request.</param>
    protected override void OnShareTargetActivated(ShareTargetActivatedEventArgs args)
    {
      //var rootFrame = new Frame();
      //rootFrame.Navigate(typeof(ShareTargetPage1), args.ShareOperation);
      //Window.Current.Content = rootFrame;
      //Window.Current.Activate();
      ShareTargetPage1 p1 = new ShareTargetPage1();
      p1.Activate(args);
    }
  }
}
